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Home Q & A Board Humanities Art and Culture
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Twitchin Twitchin
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6 years ago
Why were incidents of typhoid fever reduce by 70 percent in the early years of the twentieth century?
 
  A) improvements in public sanitation
  B) expanded transportation networks
  C) limits on immigration
  D) discovery of a new vaccine
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AseizeAseize
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6 years ago
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